A Study of the Vegetation of Southeastern Washington And Adjacent Idaho
A Study of the Vegetation of Southeastern Washington And Adjacent Idaho
John E John Ernest Weaver
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Graphs showing the march of soil water in various plant com- munities on Cedar Mountain. 35- 36 A Study of the Vegetation of dry weight. The chart shows that at no time did these virgin forests of fir-tamarack or cedar exhaust all of the water in the surface ten inches of soil. Likewise, samples at a depth of 2 feet on August i, 1914, gave a water content of 66 per cent, and 19 per cent, in the cedar and fir-tamarack forest respectively. Similar determinations at 2 feet in the rocky pine-covere...d soils gave a water content of about 10 per cent. , which is very near the wilting coefficient. The slow growth and dwarfed appearance of these trees reflect the unfavorable habitat conditions. These studies on the evaporating power of the air and the amount and range of soil moisture in different plant communities may be briefly summarized. Evaporation at different stations within the same plant com- munity exhibits variations similar both in character and degree, and the variations in the rate of evaporation gradually become less and less as the climax type of vegetation is approached.
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